抄録
Following an overview of far-infrared spectroscopy in condensed matter physics, possibility and advantage of application of far-infrared free electron laser to this field are discussed. If a laser induced phase transition occurs due to strong pumping to an excited state, it may be the most interesting phenomenon. Tunable and strong power FEL is very useful as a versatile light source in the far-infrared region. Some examples of possible experiments are described.
